docs/langchain/MIGRATE.md

Migrating

🚨Breaking Changes for select chains (SQLDatabase) on 7/28/23

In an effort to make langchain leaner and safer, we are moving select chains to langchain_experimental. This migration has already started, but we are remaining backwards compatible until 7/28. On that date, we will remove functionality from langchain. Read more about the motivation and the progress here.

Migrating to langchain_experimental

We are moving any experimental components of LangChain, or components with vulnerability issues, into langchain_experimental. This guide covers how to migrate.

Installation

Previously:

pip install -U langchain

Now (only if you want to access things in experimental):

pip install -U langchain langchain_experimental

Things in langchain.experimental

Previously:

from langchain.experimental import ...

Now:

from langchain_experimental import ...

PALChain

Previously:

from langchain.chains import PALChain

Now:

from langchain_experimental.pal_chain import PALChain

SQLDatabaseChain

Previously:

from langchain.chains import SQLDatabaseChain

Now:

from langchain_experimental.sql import SQLDatabaseChain

Alternatively, if you are just interested in using the query generation part of the SQL chain, you can check out create_sql_query_chain

from langchain.chains import create_sql_query_chain

load_prompt for Python files

Note: this only applies if you want to load Python files as prompts. If you want to load json/yaml files, no change is needed.

Previously:

from langchain.prompts import load_prompt

Now:

from langchain_experimental.prompts import load_prompt